#include <stdio.h>

int main()
{
    float radius, circumference; /* declare an input and output item */

    radius = 3.14159265358979; /* set a avlue for the radius */
    ;circumference = 2.0 * 3.1416 *radius;   /*calculate the circumference */
    printf("The circumference of  the circle is %f,radius is %f,", circumference,radius);
    
    return 0;
}